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Introduction to Servo Motors
Sep 12, 2025
A servo motor is a sophisticated electromechanical device that combines a traditional motor with an integrated feedback control system to achieve precise control of position, velocity, and acceleration. Unlike standard motors that simply rotate when powered, servo motors continuously monitor their actual position through built-in sensors and automatically adjust their operation to match commanded positions with exceptional accuracy. This closed-loop control system makes them indispensable for applications requiring precise motion control and positioning. #servo #servomotor #engineering System Components and Architecture: The servo motor system consists of several interconnected components working in harmony. The core includes either a DC or AC motor as the prime mover, coupled with a high-resolution feedback sensor such as an optical encoder or resolver that continuously reports the motor's actual position. A sophisticated control circuit or amplifier processes command signals and feedback data to generate appropriate motor drive signals. Many systems also incorporate gear reduction mechanisms to increase torque output and improve positioning resolution, creating a complete motion control solution. Types and Classifications: Servo motors are primarily classified into DC and AC variants, each with distinct characteristics. DC servo motors offer simpler control electronics and lower initial costs but require regular brush maintenance and have limited lifespan. AC servo motors, particularly brushless designs, provide higher efficiency, greater reliability, and longer service life, making them preferred for demanding industrial applications. Additionally, linear servo motors eliminate the need for rotary-to-linear motion conversion by directly producing linear movement, ideal for applications like machine tool axes and high-speed positioning systems. Operating Principles: The servo motor operates on a continuous feedback control principle where the controller sends position commands to the motor drive system. The feedback sensor constantly monitors the actual motor position and transmits this information back to the controller. The system calculates the error between the desired and actual positions, generating corrective signals to minimize this error. This real-time adjustment process, occurring hundreds or thousands of times per second, enables the motor to maintain precise positioning even under varying load conditions or external disturbances. Performance Characteristics and Control: Servo motors excel in providing exceptional accuracy, typically achieving positioning precision within ±0.01 degrees or better. They offer rapid response times with quick acceleration and deceleration capabilities, along with smooth operation across the entire speed range, including very low speeds where standard motors typically struggle. The control system can operate in multiple modes: position control for moving to specific locations, velocity control for maintaining constant speeds, and torque control for applying precise force outputs, making them versatile solutions for diverse motion requirements.
View Video Transcript
0:43
[Music]
1:00
Hello everyone. I'm Karen, the presenter of this course. Do you know what an AC
1:07
servo is? Some of you may have heard the word before, but are not really sure what it
1:13
means. Some of you may have never even seen or heard this word before. An AC
1:20
servo is a specialized device that is likely never seen in everyday life.
1:28
The word servo is derived from the Latin word servos.
1:33
Servous means to comply with commands faithfully, quickly, and accurately.
1:40
In the same way, a servo is a device that performs work accurately in accordance with commands.
1:49
Servos are used to start and stop operation at precise positions
1:57
to change speeds extremely quickly and adjust speeds in accordance with
2:03
conditions. AC means alternating current power
2:10
supply. As such, an AC servo controls alternating current motors.
2:19
The manufacturing industry continues to become increasingly more automated with
2:24
the implementation of factory automation technologies.
2:29
Plant processes can be fully automated without the need for human interaction
2:34
with the use of FA equipment. This reduces costs and improves
2:40
efficiency, safety, and quality.
2:45
AC servos in particular are necessary in manufacturing due to their ability to
2:50
precisely control devices at high speeds.
2:56
This course will cover the actual role of AC servos and the process by which
3:02
they control devices. Now let's start learning about AC servos
3:07
together. This course is divided into five major
3:13
sections. Chapter one, fundamentals of AC servos.
3:22
Chapter 2, configuration and conceptual operation of AC servos.
3:30
Chapter 3, AC servo control in more detail.
3:37
Chapter 4, usage precautions and maintenance.
3:44
Chapter 5, introduction to the MEL servo J4.
3:50
Let's start with chapter 1.
3:56
[Music] Now let's think about what kinds of
4:03
things can be done using AC servos. And here I will explain about different
4:09
types of control. AC servos provide three types of
4:16
control. Position control, speed control, and torque control.
4:24
Let's go over position control first. Position control is used, for example,
4:31
with vertical conveyance equipment in warehouses.
4:36
Objects must be transported and organized to specific locations or
4:41
positions in warehouses. AC servo position control provides the
4:46
ability to transport objects accurately to specific locations or positions.
4:54
What would happen in this scenario without the use of AC servos?
4:59
Objects are not transported to specific locations or positions, resulting in
5:05
ineffective and inefficient use of the warehouse.
5:11
AC servos are capable of position control at resolutions of micrometers,
5:17
1,000th of a millimeter. A micrometer is approximately the
5:23
thickness of a strand of human hair. AC servos provide control to levels of
5:29
precision undetectable to the human eye. Let's now cover speed control.
5:37
Speed control is used for example with devices known as spin coders which are
5:43
used to manufacture semiconductor circuits. Spin coders apply a liquid solution to a
5:50
flat substrate and then spread the solution evenly over the entire surface
5:55
using centrifugal force. What would happen in this scenario
6:01
without the use of AC servos? If the rotational speed is too high, the
6:07
solution will fly off of the substrate. If the speed is too low, the solution
6:13
will not spread evenly. AC servo speed control ensures accuracy
6:21
of processing through stable rotation at the proper speeds in accordance with the
6:27
applicable devices. Finally, let's cover torque control.
6:35
Torque is the force used to rotate shafts.
6:40
Torque control is used for example with industrial printers.
6:48
Wrinkles on the print surface on such printers can cause the printing process to fail.
6:58
AC servo torque control ensures that paper is pulled and stretched evenly so
7:04
that there are no wrinkles or sagging on the print surface.
7:11
As you can see, AC servos are devices that provide extremely precise control
7:16
to move objects to specific positions at specified speeds and levels of torque.
7:24
In the next chapter, I will discuss the configuration and mechanics of AC servos.
7:33
[Music] AC servos are primarily configured with
7:41
two devices. One is the servo amplifier which is the
7:47
control unit and the other is the servo motor which is the drive and detection
7:52
unit. However, AC servos cannot function with just the servo amplifier and servo motor
8:00
alone. A controller giving commands is also
8:06
required. Although there are exceptions, AC servo
8:11
systems are usually configured with these three components.
8:17
The controller sends instructions to the servo amplifier.
8:22
After receiving an instruction, the servo amplifier then relays this
8:27
instruction to the servo motor, which then provides drive force in accordance
8:32
with the instruction. Servo motors are also equipped with
8:38
encoders which function as detectors to detect the current position and relay
8:43
this information to the servo amplifier. The servo amplifier compares the value
8:50
of the instruction with the current value as read by the encoder and then
8:56
outputs a modified instruction to minimize the difference. This is known as feedback control.
9:04
Instead of simply sending instructions, this feedback control enables AC servos
9:11
to continually modify instructions in accordance with actual results to minimize differences.
9:18
This is how AC servos are able to provide such precise control.
9:24
Now I would like to give a brief introduction to the different types of servo motors.
9:32
Most of you probably think of motors as rotary motors such as these.
9:38
Rotary servo motors will be the focus of this course. Other types of motors include the linear
9:45
servo motor configured with a rotary motor extended along a flat surface and
9:51
a direct drive motor which looks similar to a rotary servo motor.
9:57
Make sure to select the appropriate type of servo motor for your system configuration when implementing AC
10:04
servos. [Music]
10:13
Now let's take a look at the structure of servo motors.
10:19
I will discuss the structure of rotary servo motors in this training.
10:25
Rotary servo motors are primarily configured with a stator,
10:31
rotor, and encoder.
10:37
The stator is the foundation of the motor. Wire is wrapped around the core
10:43
to provide the force needed to rotate the rotor. The rotor is the rotational shaft.
10:51
Permanent magnets are also used in the configuration.
10:56
The encoder, which is configured to detect absolute position, is directly
11:01
connected. As I mentioned just a few moments ago, the encoder is a detector that reads the
11:09
current motor position. A note of caution here.
11:16
Encoders are made using a glass disc and electronic components. These components
11:22
are fragile, so handle with care to prevent damage.
11:30
[Music] Machines that move, such as vehicles and
11:37
trains, are equipped with brakes so that they can stop. AC servos are also equipped with brakes
11:44
to stop the movement of motors. The types of brakes include dynamic
11:51
brakes, electromagnetic brakes, and regenerative brakes.
11:58
Dynamic brakes are used to stop servo motors quickly after a power outage or
12:03
servo amplifier failure. However, these brakes cannot maintain
12:09
the stop state. To maintain the stop state, use servo
12:15
motors equipped with electromagnetic brakes.
12:20
Let's take a look at some warehouse conveyance equipment.
12:29
It seems as though a power outage has occurred. The conveyance equipment in the
12:35
warehouse is stopped at the position just before the power failure occurred.
12:41
This is because the electromagnetic brake in the servo is actively maintaining this state.
12:49
This brake mechanically maintains positions so that equipment is not dropped during power outages or
12:55
emergency stops. So what would happen if this servo was
13:01
not equipped with an electromagnetic brake? The conveyance equipment would not be
13:07
stopped in the event of a power outage, which would result in the equipment being dropped and possibly causing a
13:14
serious accident. Please be aware that electromagnetic
13:20
brakes are only used to maintain a stop state and so they are not capable of
13:25
decelerating servo motors. Regenerative brakes convert surplus
13:32
rotational energy into electrical energy while motors decelerate.
13:38
This electrical energy is reused by the servo amplifier.
13:44
This energy can be used to drive other shafts which helps save energy.
13:53
These different types of brakes can be used together in a single system so that
13:58
AC servos can be used safely by using the proper type of brake for the given
14:04
situation. [Music]
14:12
In part two of the satellite training series, we learned that inverters also
14:18
drive motors at controlled speeds. So you might be thinking what is the
14:24
difference between AC servos and inverters.
14:29
AC servos and inverters are actually quite different fundamentally and are
14:35
used for different purposes. Here are some of the key differences between these two devices.
14:43
The most important difference is that AC servos have a servo lock whereas
14:49
inverters do not have any locking mechanism.
14:54
This functionality is enabled by the encoder included in the servo motor
14:59
configuration. Servo lock refers to the state in which
15:05
the servo motor maintains control of an object so as to keep the object in the
15:10
desired position. Without servo lock, external force applied to an object can move the object
15:18
out of position. With servo lock, the servo motor can
15:24
move an object that has been moved out of position back into position.
15:31
Another difference is the number of units that can be connected.
15:37
An AC servo can only be connected to one motor whereas inverters can be connected
15:43
to multiple motors. The decision on whether to use AC servos
15:50
or inverters should be made based on the application of devices, cost, and other
15:56
factors. Make sure to select the right types of equipment for your circumstances.
16:06
[Music] Now that we have learned some
16:12
fundamentals, let's take a look at AC servos in actual operation.
16:19
We will be using the Mitsubishi Electric MEL servo J4 typeA servo amplifier for
16:26
this training. For the controller, we will be using the Mitsubishi Electric programmable
16:33
controller IQR series. For the display screen, we will be using
16:40
the GT2708. We will also use a ball screw as the
16:46
mechanical system. You can also follow along with this
16:51
training exercise using a Mitsubishi electric programmable controller, IQF
16:57
series, Q series, L series, or F-series.
17:03
Just use the positioning module listed in the text.
17:08
Many devices used in a plant already contain data, and so the device you are
17:14
using for this training may already contain data. So, first let's retrieve and back up
17:21
this data. By making backups, we can restore equipment to its previous state in the
17:28
event of some error or failure. Connect a USB cable between the AC servo
17:36
and a PC. Turn on the power to the AC servo.
17:53
Start MR Configurator 2 on your PC.
17:59
A dialogue box appears with the message, do you want to create a project by
18:05
reading the parameters from the servo amplifier? Please proceed to retrieve the data.
18:13
Click yes. Set a name for the project and then save
18:20
the file.
18:37
After making the backup, clear the data in the device.
19:06
The device is now ready for you to start the training exercise.
19:12
If your device does not contain any data, simply proceed with the setting exercise.
19:18
Now, let's set the device in a predetermined order.
19:24
First start MR Configurator 2 on your PC.
19:29
The version of the software used in this training is 1.60N.
19:37
From project, click new project.
19:42
Select MRJ4A RJ. In the model menu,
19:49
select standard. In the operation mode menu, select servo amplifier connection USB.
19:59
Under connection setting, click okay.
20:05
From parameter, click parameter setting.
20:17
Click basic from the control mode pulld down menu.
20:24
Select position control mode. Next, select rotation direction.
20:33
CW refers to clockwise and CCW refers to
20:39
counterclockwise. Regarding the direction of rotation,
20:46
select CCW direction during forward pulse input. CW direction during reverse
20:55
pulse input. Then select extension 2.
21:03
From the forced stop deceleration function selection menu, select forced
21:09
stop deceleration function is enabled. Use EM2.
21:17
Next, click digital input output. Click the input signal autoon selection
21:25
button under device setting.
21:31
Enable S. S is read as servo on. The servo on
21:39
signal enables the main circuit. This signal must be turned on before
21:45
operation. Servo lock is enabled when this signal is turned on.
21:56
After you have completed setting parameters, they must be written into the servo.
22:03
Once the dialogue box appears, click yes.
22:09
When the next dialogue box appears, click yes.
22:16
Once writing has been completed, a dialogue box appears indicating that the
22:21
power to the servo amplifier needs to be turned off and on again.
22:27
Click okay to reflect any changes made to the servo
22:35
amplifier setting. Turn the power to the servo amplifier off and on again after
22:41
writing. This completes the process to set the servo in preparation for actual
22:48
operation. Let's now proceed and actually see the servo motor in action.
22:57
[Music] In this section of the course, we will
23:04
operate the training device. First, let's confirm that the servo
23:11
motor is rotating correctly before connecting it to a device.
23:17
Checking operation while the servo motor is coupled to a device may cause a
23:23
serious accident due to unexpected movement.
23:28
After confirming motor operation, connect the servo motor to the ball screw and run a test operation.
23:37
From test mode, select jog mode.
23:43
Once the dialogue box appears, click okay.
23:50
The jog operation screen appears. At this time, set the values for motor
23:56
speed and acceleration deceleration time constant.
24:02
Motor speed sets the rotational speed of the servo motor.
24:08
The unit of measure is R per min, which is an abbreviation for revolutions per
24:14
minute. Entering a value of 200 sets the motor
24:19
to rotate 200 times per minute.
24:25
Acceleration deceleration time constant sets the time for the motor to reach the
24:31
set speed. This is also the time used to decelerate the motor to a stop.
24:38
For this training, we will set a value of 1,000 milliseconds so that it takes 1 second
24:46
for the motor to reach the set speed of 200 revolutions per minute after
24:51
starting. Milliseconds is the unit of measure for this setting, which means that a value
24:58
of 1,000 equals 1 second.
25:04
Next, select the stroke end is automatically turned on check box.
25:12
Click the forward CCW button. Once the dialogue box appears, click okay.
25:22
Then click the forward CCW button again.
25:27
The ball screw should have moved. Now click the reverse CW button.
25:36
The ball screw should have moved in the opposite direction.
25:42
Now let's try using position control. We will demonstrate position control
25:49
operation by moving the indicator on the ball screw to point A.
25:56
From test mode, select jog mode.
26:07
Leave motor speed set to 200 while using the forward CCW and reverse CW buttons
26:15
to bring the moving part of the ball screw close to point A.
26:26
If the LSP or LSN limit is exceeded during this time, the servo amplifier
26:33
will stop and alarm display appears. Once the servo amplifier stops, clicking
26:41
the forward CCW and reverse CW buttons will have no effect.
26:48
Turn the power off and on again. The alarm is cleared by turning the power
26:54
off and on. Then move the motor in the opposite
27:00
direction of that before the servo amplifier stopped.
27:07
The motor should have moved again. Mechanical limits can be set in this way to ensure safety.
27:17
[Music] Now then with the moving part stopped at
27:25
point A select positioning mode from test mode.
27:33
Once the dialogue box appears click okay.
27:38
Once the move distance unit selection dialogue box appears select command
27:45
pulse unit electronic gear valid and then click okay.
27:51
The positioning mode window should appear. Motor speed and acceleration
27:57
deceleration time constant should have the same values as those previously set.
28:05
Now I would like to describe the move distance setting. As the name implies,
28:11
this setting sets the amount of movement. For this positioning control exercise,
28:17
enter the actual distance of movement. Set move distance with a value of
28:24
4,194,34.
28:30
Select the stroke end is automatically turned on checkbox.
28:38
Click the reverse CW button. Once the dialogue box appears, click
28:44
okay. Then click the reverse CW button again.
28:56
The ball screw should have moved a little. The servo motor moved in the
29:01
reverse CW direction by 4,194,34
29:07
pulses as instructed by the servo amplifier.
29:12
Despite such a large number, the amount of movement is actually quite small.
29:18
Next, let's set the electronic gear. From parameter, select parameter setting
29:28
and then select position control. Click the electronic gear button.
29:36
The electronic gear setting dialogue box appears. Find the motor encoder resolution
29:43
setting. 1,00 pulses per rev means that each
29:49
motor rotation of 360° is divided into 1,000 increments.
29:56
Servo amplifiers output a signal once every pulse. As such, in this example,
30:03
each pulse causes 0.36° of movement.
30:09
In comparison to a clock, because the second hand of the clock rotates one
30:14
rotation in 60 seconds, 360° is divided into 60 increments.
30:23
As such, the second hand moves 6° for each tick.
30:29
In this example, the servo amplifier moves 0.36°
30:34
for each increment, which is obviously a much higher resolution than a clock.
30:41
The resolution of the Mitsubishi Electric Melvo J4 is 4,194,34
30:50
pulses per revolution. This means that 360°
30:56
of rotation is divided into 4,194,34
31:02
increments. This means that this extremely high precision device causes a mere
31:09
0.0000858368
31:15
degree of movement with each pulse.
31:20
Okay, let's go back and finish the setting.
31:25
Select number of command input pulses per revolution instead of electronic
31:31
gear. Enter a value of 10,000 for the number of command input pulses per revolution
31:39
setting. This sets the servo amplifier to divide each motor rotation into 10,000 pulses.
31:50
After you have finished setting, it must be written into the servo.
31:56
Once the dialogue box appears, click yes.
32:02
Once writing has been completed, a dialogue box appears indicating that the
32:08
power to the servo amplifier needs to be turned off and on again. Click okay.
32:17
Turn the power to the servo amplifier off and on again to reflect the setting.
32:29
The positioning mode window appears again. Change the move distance setting
32:34
from 4,194,34
32:39
to 10,000.
32:45
Click the reverse CW button. Once the dialogue box appears, click
32:52
okay. Then click the reverse CW button again.
33:01
The ball screw should have moved. The motor should have rotated in the reverse
33:07
CW direction for one rotation.
33:12
The ball screw used for this training moves 5 mm per motor rotation. So it
33:18
should have moved 5 mm in the reverse CW direction.
33:25
Now let's perform control using a programmable controller.
33:30
We have prepared a programmable controller sample program for use in this training.
33:37
The sample program is stored on the accompanying disc. The disk includes IQR
33:43
series, IQF series, Q series, L series, and F-series versions of the program.
33:51
Select the program compatible with your device.
33:57
As you can see, sequence programs can be used together with the equipment to
34:02
perform complex positioning control.
34:13
[Music] While servo amplifiers are highquality
34:20
devices, they can experience issues due to usage conditions such as temperature,
34:26
humidity, and vibration, or due to parts that have deteriorated or reached the
34:32
end of their service life. Daily and periodic inspections must be
34:38
performed to prevent issues from occurring and ensure consistency of use
34:43
in plants. Daily inspections are used to confirm
34:49
that motors operate as designed and to check for any operational issues such as
34:55
abnormal vibration or noise.
35:01
Periodic inspections are used to stop equipment and perform checks not possible while operating.
35:10
Screws, bolts, and other fittings may loosen due to vibration or temperature
35:15
changes. Fittings should also be checked during periodic inspections to ensure
35:20
they are tightened properly. The air filter should also be cleaned as
35:27
part of these inspections. A note of caution here.
35:35
Some internal components store electrical charges for some time after the power is turned off.
35:44
Wait until the charge indicator lamp turns off before inspecting internal components of servo amplifiers.
35:53
Make sure to refer to manuals while performing inspections.
35:59
Some AC servo parts must be replaced periodically. The battery is one of
36:05
these parts. Servo amplifiers include a battery to
36:11
maintain the current position information stored in the encoder memory when the power to the servo amplifier is
36:18
turned off. Batteries typically last for 5 years
36:24
from the date of manufacture, but may need to be replaced before then as necessary.
36:32
Let's now go over the procedure to replace the battery.
36:37
To prevent electric shock, wait at least 15 minutes after turning off the power
36:42
to the main circuit and check that the charge indicator lamp is turned off
36:48
before replacing batteries. Use a tester to check the voltage
36:53
between the positive and negative terminals. Before replacement,
37:00
make sure you are facing the front of the servo amplifier when checking the status of the charge indicator lamp.
37:09
Make sure that only the control circuit power supply is on when replacing batteries.
37:20
The absolute position data will not be lost if you replace the battery while the control circuit power supply is on.
37:35
Mr. Configurator 2 also includes a feature called life diagnosis function.
37:43
This function lets you know when it is time to replace specific parts such as
37:48
smoothing capacitors and relays. From menu bar, select diagnosis and then
37:57
life diagnosis to view this status information.
38:04
Effective use of this function is an important part of servo amplifier preventative maintenance.
38:14
[Music] Mitsubishi electric servo amplifiers
38:21
include a display screen for alarms and warnings when issues occur during operation.
38:29
If an alarm or warning appears on the display screen, turn off the servo on
38:35
signal and shut off the power. Then follow the troubleshooting procedures
38:40
described in the manual. MR Configurator 2 can be used to find
38:47
out the causes of alarms and warnings. To find out the details of each alarm,
38:55
select diagnosis from the menu bar and then select alarm display.
39:04
This information is also available from MR configurator 2 help under help
39:26
warnings will be cleared automatically once the cause has been resolved.
39:32
After resolving the cause, alarms are cleared by either performing an alarm reset or a CPU reset or by turning the
39:41
power off and on again. I will now describe some example alarms
39:47
and their troubleshooting procedures. The alarm with an alarm code of 20.1 is
39:55
the encoder normal communication receive data error one alarm.
40:02
This alarm is caused by environmental factors such as noise.
40:08
Noise can affect various electronic devices and can be generated from a wide
40:14
range of sources. The intrusion of external noise can
40:19
cause incorrect servo amplifier operation.
40:24
Noise generated by the servo amplifier can also cause other equipment to
40:29
operate incorrectly. Also, some noise generated by peripheral
40:35
equipment will not affect servo amplifiers.
40:41
When alarm 20.1 occurs, you must find and resolve the cause of the noise. The
40:47
most common noise problem is due to the bundling of servo amplifier input and
40:53
output wires with signal wires. Try running these wires separate from each
40:58
other. If equipment near the servo amplifier generates significant noise, try
41:05
installing a surge protector for this equipment to reduce the noise generated.
41:12
If noise generated by the servo amplifier is causing issues, install a
41:17
noise filter into the servo amplifier power circuit. In this training, you
41:23
will learn how to install a radio noise filter and a line noise filter.
41:31
Use either of the two filters that is applicable to the situation when resolving actual noise issues.
41:40
The FRBIF radio noise filter reduces noise generated by the servo amplifier
41:47
power supply. Wiring must be as short as possible. The
41:54
filter must also be grounded. When using the FRBIF with a singlephase power
42:00
supply, make sure unused wires are properly insulated.
42:08
The FRBSF01 line noise filter reduces radio noise
42:14
generated from the servo amplifier power supply and output circuits.
42:20
This filter can be installed to the servo amplifier main circuit and servo
42:25
motor power supply wiring.
42:30
All wires must pass through noise filters in the same direction and frequency.
42:37
Using more filters for main circuit wiring increases the noise reducing
42:42
effect, but usually four filters are used.
42:48
Placing filters close to the servo amplifier improves the noise reducing effect.
42:56
The alarm with an alarm code of 25.1 is the servo motor encoder. Absolute
43:03
position erased alarm. This alarm occurs when the battery has reached the end of
43:09
its service life. Absolute position information will be
43:15
lost once the battery has reached the end of its service life. Replace the
43:20
batteries periodically before they completely run out to prevent having to reset absolute positions.
43:28
I will now describe the procedure to reset absolute position information if lost.
43:37
First replace the battery.
43:50
Then perform the return to origin position process.
43:57
Turn on the power to the servo amplifier and make sure the alarm has been cleared.
44:18
Use jog operation to return to the origin position of the workpiece.
44:24
Input the clear signal into the servo amplifier.
44:29
Input of the clear signal tells the servo amplifier that the current position is the origin position.
44:37
Use a programmable controller output or external switch to input the clear
44:42
signal. Besides noise, harmonics and leakage
44:47
current can also negatively affect servo systems.
44:53
Alarm code 50.1 is the thermal overload error one during operation alarm. This
45:00
alarm occurs when cables are disconnected or scrap material is jamming equipment.
45:09
Objects can jam moving parts of equipment causing them not to move correctly.
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Excessive current may then be output to try and move the part normally which causes excessive load and triggers this
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alarm. If this happens, check mechanical parts carefully.
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If this alarm occurs when there are no mechanical issues, wiring may be
45:41
disconnected or connected incorrectly. So check the wiring.
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There are many other alarms that could occur. Follow procedures in manuals when
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other alarms not covered here occur.
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[Music] Let's now spend a few minutes going over
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the exterior appearance of the Mitsubishi Electric Melvo J4 servo
46:11
amplifier. As you can see, the front of the servo
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amplifier includes the display screen, USB communication connector, encoder
46:24
connector, and power supply connector. Servo amplifiers will have other
46:30
connectors depending on the type of servo amplifier.
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There are three types of servo amplifiers including type A, type B, and
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type GF. I will now go over some of these different models in more detail.
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Type A models support generic interfaces. This is the model we used in this
46:56
training. This type supports analog and pulse train and many other types of
47:03
interfaces. It provides position, speed, and torque control.
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Type B models support dedicated servo networks and the SSCNET 3H servo system
47:20
control network. While the MRJ4B servo amplifier can drive only one
47:27
motor, other models are available to drive multiple motors, including the
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MRJ4W2B 2axis servo amplifier capable of driving
47:40
two motors and the MRJ4W3B
47:46
3axis servo amplifier capable of driving three motors.
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GF type models support the CC link IE field network.
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When combined with a simple motion module, this type can provide positioning and synchronous control of
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multiple axes. As each model comes with distinct
48:11
features, make proper selections depending on your specific environment and equipment.
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[Music] In this section of the training, I will
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discuss some of the key features of Mitsubishi Electric Melervo J4 series
48:33
devices.
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The servo motor operation that causes equipment to move also generates two
48:47
types of vibration. This includes vibration of the actual device and
48:53
vibration at the end of the arm. This vibration prevents the servo motor
48:59
from accurately stopping connected equipment at specified or desired positions.
49:07
We have developed the advanced vibration suppression control 2 feature to reduce
49:13
both types of vibration.
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Robust filters are used with high inertia equipment driven by belts and gears such as industrial printers and
49:30
packing equipment. These filters achieve high responses and stability at the same time and without
49:37
the need for tuning.
49:45
The one-touch tuning feature enables users to quickly and easily set devices
49:51
for maximum performance. The scope of the one-touch tuning
49:57
function also includes automatic tuning of the previously described advanced
50:03
vibration suppression control and robust filter features
50:14
under the concept of man machine and environment in perfect harmony.
50:20
Mitsubishi Electric strives to provide AC servos that are safe, easy to use,
50:27
and configured for optimal compatibility in any design or production environment.
50:35
For example, the goot drive function enabled when linking servos with the
50:40
Mitsubishi electric 2000 product that was covered in part three of the
50:46
satellite training series provides GOT2000 devices with some of the core
50:52
functionality of the MR configurator 2 software.
50:58
This provides the capability to make adjustments and perform checks in environments without PCs.
51:06
This also provides the flexibility to make quick adjustments and troubleshoot issues on site more readily.
51:15
This useful function improves efficiency for startup adjustment, preventative
51:21
maintenance, and other maintenance work and achieves cost reduction.
51:27
Mills servo J4 servo amplifiers have many other features not covered in this
51:32
training. Refer to the product manual for more information on product
51:37
features. Although the content was perhaps a
51:43
little complex, I hope you enjoyed this AC servo training.
51:49
In this training, you learned some AC servo fundamentals, conceptual operation
51:55
and configuration. You also got a chance to configure and operate an actual servo system.
52:03
We also covered some basic maintenance procedures. Mitsubishi electric AC servos enable
52:11
precise control of various equipment in accordance with the many specialized requirements of production environments.
52:19
I hope that you continue to deepen your knowledge so that you can use AC servos effectively.
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[Music]
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[Music]